<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app-6">
        <p>
            {{message}}
        </p>
        <input type="text" v-model="message" />
    </div>
</body>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.9/vue.js"></script>
<script>
    var app = new Vue({
        el:"#app-6",
        data:{
            message: 'hello Vue!'
        }
    });
</script>
</html>